This leads to a limited number of "the usual suspects" who will say expected ideas that will not require extensive explanation such as mainstream political ones.
[2]Furthermore, introducing controversial or unexpected statements that do not conform to those conventional ideas are discouraged as time inefficient because the person will be required to explain and support them in detail.
[1] This media control idea is illustrated in the film documentary, Manufacturing Consent: Noam Chomsky and the Media, where journalist Jeff Greenfield explains why a person like Chomsky may be excluded from being interviewed on air because he takes too long to warm up.
[1] The 1999 feature film The Insider has a dramatization of the media concept where journalist Mike Wallace goes public on a news show about the censoring of a controversial story on 60 Minutes.
When Wallace sees his interview broadcast, he is furious that his testimony is limited to a curt statement that does not adequately explain his position and the only excuse from the producers he receives is that it had to be cut for time.